EM ExtraMile at 8687 Base Line Road, Rancho Cucamonga, California.

I come in for coffee all the time. Every single employee that I have met here has been outstanding with their customer service. They all have great positive attitudes, and are so friendly. They're even nice and polite to the rude customers who won't put down their phone when paying for their food/drinks!

Also, the coffee here is great (Seattle's Best) and costs less than starbucks. There's also typically good deals with buying a drink and donuts or other snacks too.